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Modular ipso/ortho Difunctionalization of Aryl Bromides via Palladium/Norbornene Cooperative Catalysis
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2018-06-15 , DOI: 10.1021/jacs.8b04153 Zhe Dong 1 , Gang Lu 2 , Jianchun Wang 1 , Peng Liu 2 , Guangbin Dong 1
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2018-06-15 , DOI: 10.1021/jacs.8b04153 Zhe Dong 1 , Gang Lu 2 , Jianchun Wang 1 , Peng Liu 2 , Guangbin Dong 1
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Palladium/norbornene (Pd/NBE) cooperative catalysis has emerged as a useful tool for preparing poly substituted arenes; however, its substrate scope has been largely restricted to aryl iodides. While aryl bromides are considered as standard substrates for Pd-catalyzed cross coupling reactions, their use in Pd/NBE catalysis remains elusive. Here we describe the development of general approaches for aryl bromide-mediated Pd/NBE cooperative catalysis. Through careful tuning the phosphine ligands and quenching nucleophiles, ortho amination, acylation and alkylation of aryl bromides have been realized in good efficiency. Importantly, various heteroarene substrates also work well and a wide range of functional groups are tolerated. In addition, the utility of these methods has been demonstrated in sequential cross coupling/ ortho functionalization reactions, consecutive Pd/NBE-catalyzed difunctionalization to construct penta-substituted aromatics and two-step meta functionalization reactions. Moreover, the origin of the ligand effect in ortho amination reactions has been explored through DFT studies. It is expected that this effort would significantly expand the reaction scope and enhance the synthetic potential for Pd/NBE catalysis in preparing complex aromatic compounds.
中文翻译：
钯/降冰片烯协同催化芳基溴化物的模块化原位/邻位双官能化
钯/降冰片烯（Pd/NBE）协同催化已成为制备多取代芳烃的有用工具；然而，其底物范围很大程度上限于芳基碘化物。虽然芳基溴被认为是 Pd 催化交叉偶联反应的标准底物，但它们在 Pd/NBE 催化中的应用仍然难以捉摸。在这里，我们描述了芳基溴介导的 Pd/NBE 协同催化的一般方法的发展。通过仔细调整膦配体和猝灭亲核试剂，芳基溴的邻位胺化、酰化和烷基化已经实现了良好的效率。重要的是，各种杂芳烃底物也能很好地工作，并且可以耐受多种官能团。此外，这些方法的实用性已在连续交叉偶联/邻位官能化反应、连续 Pd/NBE 催化双官能化以构建五取代芳族化合物和两步间位官能化反应中得到证明。此外，通过DFT研究探索了邻位胺化反应中配体效应的起源。预计这一努力将显着扩大反应范围并增强 Pd/NBE 催化制备复杂芳香族化合物的合成潜力。
更新日期：2018-06-15
中文翻译：
钯/降冰片烯协同催化芳基溴化物的模块化原位/邻位双官能化
钯/降冰片烯（Pd/NBE）协同催化已成为制备多取代芳烃的有用工具；然而，其底物范围很大程度上限于芳基碘化物。虽然芳基溴被认为是 Pd 催化交叉偶联反应的标准底物，但它们在 Pd/NBE 催化中的应用仍然难以捉摸。在这里，我们描述了芳基溴介导的 Pd/NBE 协同催化的一般方法的发展。通过仔细调整膦配体和猝灭亲核试剂，芳基溴的邻位胺化、酰化和烷基化已经实现了良好的效率。重要的是，各种杂芳烃底物也能很好地工作，并且可以耐受多种官能团。此外，这些方法的实用性已在连续交叉偶联/邻位官能化反应、连续 Pd/NBE 催化双官能化以构建五取代芳族化合物和两步间位官能化反应中得到证明。此外，通过DFT研究探索了邻位胺化反应中配体效应的起源。预计这一努力将显着扩大反应范围并增强 Pd/NBE 催化制备复杂芳香族化合物的合成潜力。
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